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1 -- CC51006.A
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2 --
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3 -- Grant of Unlimited Rights
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4 --
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5 -- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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6 -- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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7 -- unlimited rights in the software and documentation contained herein.
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8 -- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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9 -- this public release, the Government intends to confer upon all
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10 -- recipients unlimited rights equal to those held by the Government.
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11 -- These rights include rights to use, duplicate, release or disclose the
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12 -- released technical data and computer software in whole or in part, in
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13 -- any manner and for any purpose whatsoever, and to have or permit others
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14 -- to do so.
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15 --
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16 -- DISCLAIMER
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17 --
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18 -- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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19 -- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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20 -- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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21 -- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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22 -- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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23 -- PARTICULAR PURPOSE OF SAID MATERIAL.
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24 --*
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25 --
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26 -- OBJECTIVE:
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27 -- Check that, in an instance, each implicit declaration of a primitive
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28 -- subprogram of a formal (nontagged) derived type declares a view of
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29 -- the corresponding primitive subprogram of the ancestor type, even if
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30 -- the subprogram has been overridden for the actual type. Check that for
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31 -- a formal derived type with no discriminant part, if the ancestor
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32 -- subtype is an unconstrained scalar subtype then the actual may be
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33 -- either constrained or unconstrained.
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34 --
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35 -- TEST DESCRIPTION:
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36 -- The formal derived type has no discriminant part, but the ancestor
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37 -- subtype is unconstrained, making the formal type unconstrained. Since
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38 -- the ancestor subtype is a scalar subtype (not an access or composite
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39 -- subtype), the actual may be either constrained or unconstrained.
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40 --
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41 -- Declare a root type of a class as an unconstrained scalar (use floating
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42 -- point). Declare a primitive subprogram of the root type. Declare a
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43 -- generic package which has a formal derived type with the scalar root
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44 -- type as ancestor. Inside the generic, declare an operation which calls
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45 -- the ancestor type's primitive subprogram. Derive both constrained and
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46 -- unconstrained types from the root type and override the primitive
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47 -- subprogram for each. Declare a constrained subtype of the unconstrained
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48 -- derivative. Instantiate the generic package for the derived types and
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49 -- the subtype and call the "generic" operation for each one. Confirm that
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50 -- in all cases the root type's implementation of the primitive
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51 -- subprogram is called.
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52 --
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53 --
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54 -- CHANGE HISTORY:
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55 -- 06 Dec 94 SAIC ACVC 2.0
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56 --
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57 --!
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58
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59 package CC51006_0 is -- Weight class.
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60
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61 type Weight_Type is digits 3; -- Root type of class (unconstrained).
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62
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63 function Weight_To_String (Wt : Weight_Type) return String;
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64
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65 -- ... Other operations.
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66
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67 end CC51006_0;
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68
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69
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70 --==================================================================--
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71
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72
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73 package body CC51006_0 is
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74
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75 -- The implementations of the operations below are purely artificial; the
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76 -- validity of their implementations in the context of the abstraction is
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77 -- irrelevant to the feature being tested.
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78
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79 function Weight_To_String (Wt : Weight_Type) return String is
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80 begin
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81 if Wt > 0.0 then -- Always true for this test.
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82 return ("Root type's implementation called");
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83 else
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84 return ("Unexpected result ");
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85 end if;
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86 end Weight_To_String;
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87
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88 end CC51006_0;
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89
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90
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91 --==================================================================--
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92
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93
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94 with CC51006_0; -- Weight class.
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95 generic -- Generic weight operations.
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96 type Weight is new CC51006_0.Weight_Type;
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97 package CC51006_1 is
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98
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99 procedure Output_Weight (Wt : in Weight; TC_Return : out String);
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100
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101 -- ... Other operations.
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102
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103 end CC51006_1;
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104
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105
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106 --==================================================================--
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107
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108
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109 package body CC51006_1 is
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110
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111
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112 -- The implementation of this procedure is purely artificial, and contains
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113 -- an artificial parameter for testing purposes: the procedure returns the
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114 -- weight string to the caller.
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115
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116 procedure Output_Weight (Wt : in Weight; TC_Return : out String) is
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117 begin
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118 TC_Return := Weight_To_String (Wt); -- Should always call root type's
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119 end Output_Weight; -- implementation.
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120
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121
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122 end CC51006_1;
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123
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124
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125 --==================================================================--
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126
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127
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128 with CC51006_0; -- Weight class.
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129 use CC51006_0;
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130 package CC51006_2 is -- Extensions to weight class.
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131
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132 type Grams is new Weight_Type; -- Unconstrained
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133 -- derivative.
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134
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135 function Weight_To_String (Wt : Grams) return String; -- Overrides root
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136 -- type's operation.
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137
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138 subtype Milligrams is Grams -- Constrained
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139 range 0.0 .. 0.999; -- subtype (of der.).
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140
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141 type Pounds is new Weight_Type -- Constrained
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142 range 0.0 .. 500.0; -- derivative.
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143
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144 function Weight_To_String (Wt : Pounds) return String; -- Overrides root
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145 -- type's operation.
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146
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147 end CC51006_2;
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148
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149
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150 --==================================================================--
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151
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152
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153 package body CC51006_2 is
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154
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155 -- The implementations of the operations below are purely artificial; the
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156 -- validity of their implementations in the context of the abstraction is
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157 -- irrelevant to the feature being tested.
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158
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159 function Weight_To_String (Wt : Grams) return String is
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160 begin
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161 return ("GRAMS: Should never be called ");
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162 end Weight_To_String;
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163
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164
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165 function Weight_To_String (Wt : Pounds) return String is
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166 begin
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167 return ("POUNDS: Should never be called ");
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168 end Weight_To_String;
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169
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170 end CC51006_2;
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171
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172
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173 --==================================================================--
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174
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175
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176 with CC51006_1; -- Generic weight operations.
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177 with CC51006_2; -- Extensions to weight class.
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178
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179 with Report;
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180 procedure CC51006 is
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181
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182 package Metric_Wts_G is new CC51006_1 (CC51006_2.Grams); -- Unconstr.
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183 package Metric_Wts_MG is new CC51006_1 (CC51006_2.Milligrams); -- Constr.
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184 package US_Wts is new CC51006_1 (CC51006_2.Pounds); -- Constr.
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185
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186 Gms : CC51006_2.Grams := 113.451;
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187 Mgm : CC51006_2.Milligrams := 0.549;
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188 Lbs : CC51006_2.Pounds := 24.52;
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189
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190
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191 subtype TC_Buffers is String (1 .. 33);
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192
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193 TC_Expected : constant TC_Buffers := "Root type's implementation called";
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194 TC_Buffer : TC_Buffers;
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195
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196 begin
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197 Report.Test ("CC51006", "Check that, in an instance, each implicit " &
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198 "declaration of a primitive subprogram of a formal " &
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199 "(nontagged) type declares a view of the corresponding " &
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200 "primitive subprogram of the ancestor type");
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201
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202
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203 Metric_Wts_G.Output_Weight (Gms, TC_Buffer);
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204
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205 if TC_Buffer /= TC_Expected then
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206 Report.Failed ("Root operation not called for unconstrained derivative");
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207 end if;
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208
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209
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210 Metric_Wts_MG.Output_Weight (Mgm, TC_Buffer);
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211
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212 if TC_Buffer /= TC_Expected then
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213 Report.Failed ("Root operation not called for constrained subtype");
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214 end if;
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215
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216
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217 US_Wts.Output_Weight (Lbs, TC_Buffer);
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218
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219 if TC_Buffer /= TC_Expected then
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220 Report.Failed ("Root operation not called for constrained derivative");
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221 end if;
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222
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223 Report.Result;
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224 end CC51006;
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